@article{SF_1996__52_3_135442,
     author = {K. Shoji},
     title = {Absolute flatness of regular semigroups with a finite height function.},
     journal = {Semigroup forum},
     pages = {133--140},
     publisher = {mathdoc},
     volume = {52},
     number = {3},
     year = {1996},
     zbl = {0844.20054},
     url = {http://geodesic.mathdoc.fr/item/SF_1996__52_3_135442/}
}